<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<style type="text/css">
h1,h2,h3,.pp{
font-weight: bold;
color: blue;
text-decoration: underline;
}
h3{  /* 우선수위는 위 h3과 같으나 위치상 아래이므로 덮어 쓴다*/
font-size: 30px
letter-spacingL: 5em;
word-spacing: 5em;
text-decoration: line-through;
}

</style>
</head>
<body>
<h1>1수준 제목</h1>
<h2 id="red">2수준 제목</h2>
<h3>3수준 제목</h3>
</body>
</html>